JPH0121686Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a centering device for a cutting tool used in lathes, turret lathes, etc.

When processing materials using the above lathe, etc., select an appropriate tool such as a flat tool tool, serious tool tool, or boring tool tool depending on the type of processing, and attach it to the tool rest directly or via a tool holder. However, at this time, centering of the cutting tool is performed.

Conventionally, centering of a cutting tool has been carried out by selecting an appropriate spacer from among a large number of spacers and placing one or more spacers in combination under the cutting tool or tool holder.

However, in the above case, not only is it time-consuming to select the appropriate spacer from a large number of spacers, but the position of the cutting tool is adjusted depending on the number of spacers, etc., making it difficult to make fine adjustments. This method has the disadvantage that it requires skill, and moreover, the above-mentioned work has to be carried out each time the tool is replaced, making the work of centering the tool complicated.

As a way to deal with this problem,
No. 12312 exists, but since the tool support is fixed to the main body with a shaft bolt and nut extending in the horizontal direction, (a) replacing the tool support is troublesome. (b) The structure is complicated and the cost is high. (c) A piece that is prone to rattling due to vertical vibrations that occur during cutting of the workpiece. (d) The scope of application is narrow because it cannot be directly applied to the tool rest of a general-purpose lathe. There was a problem.

Therefore, the present invention was devised to eliminate the drawbacks of the prior art.The tip side of the bite member can be easily raised and lowered, and centering work can be performed quickly.(e) The structure is simple and can be manufactured at low cost. (f) Easy replacement work with other bite members. (g) No wobbling in the vertical direction during machining. (h) Can be applied directly to the turret of a general-purpose lathe. The purpose is to provide a centering device for a cutting tool.

The present invention will be described below in detail based on the illustrated embodiment. In FIG. There is.

This tool holder 4 has a square bar-shaped base 4a.
and an inverted U-shaped tool mounting part 4 having a concave groove 5.
b, and the bit mounting portion 4b is provided with a pair of dovetail grooves 6, 6 facing each other along the longitudinal direction, and the mounting screw 3 is provided with a head portion 3a as shown in FIG. It has a notch 7. The tool holder 4 having such a structure has the completed tool 2 fitted into the dovetail grooves 6, 6, and the nut 3b of the mounting screw.
The completed cutting tool 2 is fixed by tightening.

The base portion 4a of the tool holder 4 has a flat lower surface 4a' and a flat lower surface 4a'.
At the tip of a', that is, at the neck portion of the holder 4, a recess 8 having a substantially semicircular cross section is formed over the entire width.

On the other hand, 9 is a plate-shaped spacer placed under the base 4a of the tool holder, and this spacer 9 is formed to have an arbitrary thickness and has a length comparable to that of the base 4a of the tool holder. The upper surface 9' of the spacer 9 is flat like the lower surface 4a' of the base of the holder. Note that the upper surface 9'
may be formed into a tapered surface having a certain angle with respect to the lower surface 9'', if necessary.

A convex portion 10 having a substantially semicircular cross section is formed over the entire width at the tip of the upper surface 9' of the spacer, and the spacer 9 allows the convex portion 10 to fit into the concave portion 8 of the tool holder 4. As a result, the distal end side of the bite member 1 is supported in a state where it can be freely raised and lowered.

Further, an adjustment screw 11 is screwed onto the base portion 4a of the tool holder so that its tip contacts the upper surface 9' of the spacer 9, and a knurled knob 12 is attached to the head of the adjustment screw 11. It is provided.

However, in order to use the device with the above configuration, a spacer 9 is provided under the tool holder 4 as shown in FIG.
At the same time, the concave part 8 and the convex part 1 of both 4 and 9 are laid.
0 and placed on the tool rest 13, and the tip of the adjusting screw 11 is moved forward and backward by rotating the knurl knob 12 of the adjusting screw 11, so that the tip of the adjusting screw 11 touches the top surface of the spacer 9. 9', the distance between the proximal ends of the cutting tool holder 4 and the spacer 9 changes, and the cutting tool holder 4 moves upward. Along with this elevation of the tool holder 4, the holder 4
The tip of cutting tool 2, which is fixed to , moves up and down.
After performing the centering operation in this way, the tool rest 1
Mounting bolts 14, 14 formed integrally with 3 and screwed vertically into a horizontally extending overhang.
By tightening, the cutting tool holder 4 is fixed to the tool rest 13.

In addition, in the above explanation, the bite member 1 is referred to as the bite member 2.
Although the cutting tool holder 4 has a fixed tool, the tool member 1 may of course be the cutting tool 15 itself as shown in FIG. 3, and the other constructions are the same as in the above embodiment.

Furthermore, when removing or replacing the bite member 1, after slightly loosening the mounting bolts 14, 14, pull the bite member 1 toward you along the recess 8 to remove it, and then replace the recess 8 of another bite member 1 prepared in advance. It is sufficient to fit it into the convex portion 10 of the spacer 9 and push it forward.

As explained above, the present invention consists of a cutting tool or a cutting tool holder to which the cutting tool is fixed. A spacer having a protrusion in the width direction that can be fitted into the recess is provided, and by fitting the protrusion into the recess, the cutting tool member is supported in a state where its tip side can be freely lowered, and the cutting tool member is The feature is that an adjustment screw is screwed onto the rear end side so that the tip of the threaded part comes into contact with the top surface of the spacer, which not only makes it possible to center the cutting tool easily and in a short time, but also allows other users to It is also possible to replace the bite member extremely quickly. In addition, since the structure is simple, it is easy to handle, and manufacturing costs can be reduced. Furthermore, it does not rattle due to vibration during cutting, and can be used as is in the tool rest of a general-purpose lathe, making it extremely versatile. It has various effects such as.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the centering device according to the present invention in a state of use, Fig. 2 is a side view of a tool holder which is a part of the concentric device, and Fig. 3 is a view of the other embodiment of the centering device according to the present invention. It is a front view showing an example of this. 1... Bit member, 2... Bit, 4... Bit holder, 8... Recess, 9... Spacer, 10
...Protrusion, 11...Adjustment screw.

Claims (1)

[Scope of utility model registration request] A cutting tool member consisting of a cutting tool or a cutting tool holder to which the cutting tool is fixed, and having a recess in the width direction on the distal end side of the lower surface, and a recess in the width direction that is laid under the cutting tool member and that can fit the recess on the distal end side. By providing a spacer having a convex portion and fitting the convex portion into the concave portion, the cutting tool member is supported in a state where the tip side thereof can be raised and raised freely, and the tip of the threaded portion is provided on the rear end side of the cutting tool member. A centering device for a cutting tool, characterized in that the adjustment screw is screwed onto the top surface of a spacer.